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---
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title: Running python scripts using different package versions
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tags: [python, python3, pacman, pip, venv, script, shell, bash, AUR]
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updated: 2019-12-10 19:53
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description: A couple of ways to prevent file conflicts on python packages and run scripts without package version problems
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---
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## Introduction
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Installing Python packages from pacman as well as pip, using the root user,
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is not a good idea because pacman cannot keep track of files
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written by pip in the installation directories. File conflicts
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are easy to come out.
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<!--more-->
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This problem stands out especially when using Python 3 packages
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installed from AUR because of their lack of maintenance. In this case
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I was tempted to run ``pip3 install ${PACKAGE}``...
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Have a look at [this article](https://opensource.com/article/19/4/managing-python-packages)
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which is released under the Creative Commons Attribution-ShareAlike 4.0 International License
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by László Kiss Kollár.
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## Solutions
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Just as the original article explains, I suggest two methods:
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1. use the user installation method if you just need the executable
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2. use the virtual environment method if you need to import a module
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for a script.
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The only problem of these two systems is that package updates need to be
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handled manually.
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### User installation method
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Add the following to your shell's configuration (with GNU Bash use `~/.bashrc`):
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export PATH=$HOME/.local/bin:$PATH
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Reload your shell and run:
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pip3 install "${PACKAGE_NAME}" --user
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You can now call the executable just like you would do after
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installing a package using the root user (`# pip3 install "${PACKAGE_NAME}"`)
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### Virtual environment method
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Install virtualenv and then create a new virtual environment:
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```shell
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python3 -m venv ~/.local/venv/"${ENVIRONMENT_NAME}"
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. ~/.local/venv/"${ENVIRONMENT_NAME}"/bin/activate
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pip3 install ${YOUR_PACKAGES}
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deactivate
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```
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To run a script using the newly created virtual environment
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you must call the virtual interpreter directly:
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~/.local/venv/"${ENVIRONMENT_NAME}"/bin/python3 "${SCRIPT_PATH}"
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Finally, add the path of the virtual environment executables to
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the shell's path:
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export PATH=$PATH:$HOME/.local/venv/"${ENVIRONMENT_NAME}"/bin
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Reload your shell to be able to call a virtual environment executable directly.
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## Conclusion
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Don't mess up your Python installation and have fun :)
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